Employee Benefits and Stock-based Compensation - Restricted Stock Unit Activities (Detail) - Restricted Stock Unit [Member] - $ / shares	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Unvested, beginning balance	2,432,640	2,573,359	2,651,135
Shares, Granted	1,478,425	1,305,401	1,549,174
Shares, Vested	(1,106,546)	(1,220,608)	(1,513,972)
Shares, Forfeited	(159,140)	(225,512)	(112,978)
Shares, Unvested, ending balance	2,645,379	2,432,640	2,573,359
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance	$ 82.54	$ 86.81	$ 85.41
Weighted-Average Grant-Date Fair Value, Granted	62.4	70.32	74.45
Weighted-Average Grant-Date Fair Value, Vested	76.43	78.62	71.32
Weighted-Average Grant-Date Fair Value, Forfeited	115.67	81.79	99.46
Weighted-Average Grant-Date Fair Value, Unvested, ending balance	$ 71.84	$ 82.54	$ 86.81